verify(smbFile, times(1)).length();
        verifyNoMoreInteractions(smbFile);
    }

    @Test
    @DisplayName("accept: propagates SmbException thrown by dependency")
    void accept_propagatesSmbException() throws Exception {
        // Arrange: filter delegates to isDirectory which may throw SmbException
        SmbFileFilter filter = f -> f.isDirectory();
        SmbException boom = new SmbException("io error");